A complete and comprehensive treatment of the physics of the stellar interior and the underlying fundamental processes and parameters. The text presents an overview of the models developed to explain the stability, dynamics and evolution of the stars, and great care is taken to detail the various stages in a star's life. The authors have succeeded in producing a unique text based on their own pioneering work in stellar modeling.
Since its publication, this textbook has come to be considered a classic by both readers and teachers in astrophysics. This study edition is intended for students in astronomy and physics alike.

I The Basic Equations.- 1. Coordinates, Mass Distribution, and Gravitational Field in Spherical Stars.- 1.1 Eulerian Description.- 1.2 Lagrangian Description.- 1.3 The Gravitational Field.- 2. Conservation of Momentum.- 2.1 Hydrostatic Equilibrium.- 2.2 The Role of Density and Simple Solutions.- 2.3 Simple Estimates of Central Values Pc, Tc.- 2.4 The Equation of Motion for Spherical Symmetry.- 2.5 The Non-spherical Case.- 2.6 Hydrostatic Equilibrium in General Relativity.- 2.7 The Piston Model.- 3. The Virial Theorem.- 3.1 Stars in Hydrostatic Equilibrium.- 3.2 The Virial Theorem of the Piston Model.- 3.3 The Kelvin-Helmholtz Time-scale.- 3.4. The Virial Theorem for Non-vanishing Surface Pressure.- 4. Conservation of Energy.- 4.1 Thermodynamic Relations.- 4.2 Energy Conservation in Stars.- 4.3 Global and Local Energy Conservation.- 4.4 Time-scales.- 5. Transport of Energy by Radiation and Conduction.- 5.1 Radiative Transport of Energy.- 5.1.1 Basic Estimates.- 5.1.2 Diffusion of Radiative Energy.- 5.1.3 The Rosseland Mean for ??.- 5.2 Conductive Transport of Energy.- 5.3 The Thermal Adjustment Time of a Star.- 5.4 Thermal Properties of the Piston Model.- 6. Stability Against Local, Non-spherical Perturbations.- 6.1 Dynamical Instability.- 6.2 Oscillation of a Displaced Element.- 6.3 Vibrational Stability.- 6.4 The Thermal Adjustment Time.- 6.5 Secular Instability.- 6.6 The Stability of the Piston Model.- 7. Transport of Energy by Convection.- 7.1 The Basic Picture.- 7.2 Dimensionless Equations.- 7.3 Limiting Cases, Solutions, Discussion.- 8. The Chemical Composition.- 8.1 Relative Mass Abundances.- 8.2 Variation of Composition with Time.- 8.2.1 Radiative Regions.- 8.2.2 Diffusion.- 8.2.3 Convective Regions.- II The Overall Problem.- 9. The Differential Equations of Stellar Evolution.- 9.1 The Full Set of Equations.- 9.2 Time-scales and Simplifications.- 10. Boundary Conditions.- 10.1 Central Conditions.- 10.2 Surface Conditions.- 10.3 Influence of the Surface Conditions and Properties of Envelope Solutions.- 10.3.1 Radiative Envelopes.- 10.3.2 Convective Envelopes.- 10.3.3 Summary.- 10.3.4 The T-r Stratification.- 11. Numerical Procedure.- 11.1 The Shooting Method.- 11.2 The Henyey Method.- 11.3 Treatment of the First- and Second-Order Time Derivatives.- 12. Existence and Uniqueness of Solutions.- 12.1 Notation and Outline of the Procedure.- 12.2 Models in Complete Equilibrium.- 12.2.1 Fitting Conditions in the Pc - Tc Plane.- 12.2.2 Local Uniqueness.- 12.2.3 Variation of Parameters.- 12.3 Hydrostatic Models without Thermal Equilibrium.- 12.3.1 Degrees of Freedom and Fitting Conditions.- 12.3.2 Local Uniqueness.- 12.3.3 Variation of Parameters.- 12.4 Connection with Stability Problems.- 12.5 Non-local Properties of Equilibrium Models.- III Properties of Stellar Matter.- 13. The Ideal Gas with Radiation.- 13.1 Mean Molecular Weight and Radiation Pressure.- 13.2 Thermodynamic Quantities.- 14. Ionization.- 14.1 The Boltzmann and Saha Formulae.- 14.2 Ionization of Hydrogen.- 14.3 Thermodynamical Quantities for a Pure Hydrogen Gas.- 14.4 Hydrogen-Helium Mixtures.- 14.5 The General Case.- 14.6 Limitation of the Saha Formula.- 15. The Degenerate Electron Gas.- 15.1 Consequences of the Pauli Principle.- 15.2 The Completely Degenerate Electron Gas.- 15.3 Limiting Cases.- 15.4 Partial Degeneracy of the Electron Gas.- 16. The Equation of State of Stellar Matter.- 16.1 The Ion Gas.- 16.2 The Equation of State.- 16.3 Thermodynamic Quantities.- 16.4 Crystallization.- 16.5 Neutronization.- 17. Opacity.- 17.1 Electron Scattering.- 17.2 Absorption Due to Free-Free Transitions.- 17.3 Bound-Free Transitions.- 17.4 Bound-Bound Transitions.- 17.5 The Negative Hydrogen Ion.- 17.6 Conduction.- 17.7 Opacity Tables.- 18. Nuclear Energy Production.- 18.1 Basic Considerations.- 18.2 Nuclear Cross-sections.- 18.3 Thermonuclear Reaction Rates.- 18.4 Electron Shielding.- 18.5 The Major Nuclear Burnings.- 18.5.1 Hydrogen Burning.- 18.5.2 Helium Burning.- 18.5.3 Carbon Burning etc..- 18.6 Neutrinos.- IV Simple Stellar Models.- 19. Polytropic Gaseous Spheres.- 19.1 Polytropic Relations.- 19.2 Polytropic Stellar Models.- 19.3 Properties of the Solutions.- 19.4 Application to Stars.- 19.5 Radiation Pressure and the Polytrope n = 3.- 19.6 Polytropic Stellar Models with Fixed K.- 19.7 Chandrasekhar's Limiting Mass.- 19.8 Isothermal Spheres of an Ideal Gas.- 19.9 Gravitational and Total Energy for Polytropes.- 19.10 Supermassive Stars.- 19.11 A Collapsing Polytrope.- 20. Homology Relations.- 20.1 Definitions and Basic Relations.- 20.2 Applications to Simple Material Functions.- 20.2.1 The Case d ? = 0.- 20.2.2 The Case ? = ? = ? = 1, a = b = 0.- 20.2.3 The Role of the Equation of State.- 20.3 Homologous Contraction.- 21. Simple Models in the U-V Plane.- 21.1 The U-V Plane.- 21.2 Radiative Envelope Solutions.- 21.3 Fitting of a Convective Core.- 21.4 Fitting of an Isothermal Core.- 22. The Main Sequence.- 22.1 Surface Values.- 22.2 Interior Solutions.- 22.3 Convective Regions.- 22.4 Extreme Values of M.- 23. Other Main Sequences.- 23.1 The Helium Main Sequence.- 23.2 The Carbon Main Sequence.- 23.3 Main Sequences as Linear Series of Stellar Models.- 23.4 Generalized Main Sequences.- 24. The Hayashi Line.- 24.1 Luminosity of Fully Convective Models.- 24.2 A Simple Description of the Hayashi Line.- 24.3 The Neighbourhood of the Hayashi Line and the Forbidden Region.- 24.4 Numerical Results.- 24.5 Limitations for Fully Convective Models.- 25. Stability Considerations.- 25.1 General Remarks.- 25.2 Stability of the Piston Model.- 25.2.1 Dynamical Stability.- 25.2.2 Inclusion of Non-adiabatic Effects.- 25.3 Stellar Stability.- 25.3.1 Perturbation Equations.- 25.3.2 Dynamical Stability.- 25.3.3 Non-adiabatic Effects.- 25.3.4 The Gravothermal Specific Heat.- 25.3.5 Secular Stability Behaviour of Nuclear Burning.- V Early Stellar Evolution.- 26. The Onset of Star Formation.- 26.1 The Jeans Criterion.- 26.1.1 An Infinite Homogeneous Medium.- 26.1.2 A Plane Parallel Layer in Hydrostatic Equilibrium.- 26.2 Instability in the Spherical Case.- 26.3 Fragmentation.- 27. The Formation of Protostars.- 27.1 Free-Fall Collapse of a Homogeneous Sphere.- 27.2 Collapse onto a Condensed Object.- 27.3 A Collapse Calculation.- 27.4 The Optically Thin Phase and the Formation of a Hydrostatic Core.- 27.5 Core Collapse.- 27.6 Evolution in the Hertzsprung-Russell Diagram.- 28. Pre-Main-Sequence Contraction.- 28.1 Homologous Contraction of a Gaseous Sphere.- 28.2 Approach to the Zero-Age Main Sequence.- 29. From the Initial to the Present Sun.- 29.1 Choosing the Initial Model.- 29.2 Solar Neutrinos.- 30. Chemical Evolution on the Main Sequence.- 30.1 Change in the Hydrogen Content.- 30.2 Evolution in the Hertzsprung-Russell Diagram.- 30.3 Time-scales for Central Hydrogen Burning.- 30.4 Complications Connected with Convection.- 30.4.1 Convective Overshooting.- 30.4.2 Semiconvection.- 30.5 The Schönberg-Chandrasekhar Limit.- 30.5.1 A Simple Approach - The Virial Theorem and Homology.- 30.5.2 Integrations for Core and Envelope.- 30.5.3 Complete Solutions for Stars with Isothermal Cores.- VI Post-Main-Sequence Evolution.- 31. Evolution Through Helium Burning - Massive Stars.- 31.1 Crossing the Hertzsprung Gap.- 31.2 Central Helium Burning.- 31.3 The Cepheid Phase.…